SM-42W202

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Trimmer Potentiometers

A trimmer potentiometer, also known as a trimmer or trim pot, is a variable resistor with three terminals. The two outer terminals are connected to a resistor element that has a wiper arm in the middle that slides over the carbon element. This wiper arm can be adjusted to obtain different resistance values. Due to its small size, trimmer potentiometers are primarily used for trimming and adjusting the electronic circuits.

SM-42W202 is an example of trimmer potentiometer. This particular product has the maximum resistance of 20 kilo ohms, the operating temperature range from -20°C to +65°C, and it is designed to have life cycles of up to 200,000 times. It is a trusted trimmer potentiometer that is used in many applications.

Application Field

SM-42W202 trimmer potentiometers are widely used in various fields such as industrial automation, consumer electronics, medical equipment, automobiles, and telecommunication devices. Its small size allows it to be used in both SMD and THT mountings in a wide variety of applications. SM-42W202 is also ideal for adjusting resistance in many applications such as tuning amplifiers, adjusting input offset voltage, and adjusting LED brightness.

Working Principle

The working principle of SM-42W202 trimmer potentiometer is similar to other trimmer potentiometers. It consists of three terminals: one terminal is connected to a metal contact, another terminal is connected to a plastic body, and the third terminal is connected to a wiper arm. When the wiper arm moves along the metal contact, the resistance between the terminals changes. This change is used to adjust the circuit parameters as per the user requirements.

The plastic body and metal contact form the two outer terminals of the trimmer while the wiper arm forms the third terminal. The wiper arm is connected to a spiral track which winds up when the adjustment screw is turned clockwise, and winds down when the adjustment screw is turned the other way. This spiral track is connected to the wiper arm, which is adjustable over the full resistance range of the trimmer.

The design of SM-42W202 is such that it will maintain its position automatically even without using the adjustment screw, thus providing reliable and stable resistance values. This feature of the trimmer makes it ideal for applications where position control is critical.

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